LEKI Thermolite Xl Antishock Trekking Pole Ultralite shafts: small diameter (16/14/12mm), 7075 heat-treated shafts reduce weight without sacrificing strength or durability LEKI's new grip shape and design incorporates the Positive Angle INTO the grip- providing smaller packing size of the poles (4" shorter than with Positive Angle shafts); features comfortable Thermo foam grip material is comfortable and lightweight Foam Grip Extension - additional gripping area on upper shaft to handle switchbacks and abrupt changes in terrain quick and easy. Super Lock System (SLS): the strongest pole locking system available as tested by TUV; secure adjustment hold with the least amount of torque (hand strength required) offers secure, reliable support; up to 6x more secure than other locking systems. Soft Antishock System Lite (SAS-L): internal suspension system cushions the impact of each pole plant for comfort and security especially while descending trails. It is 20% lighter than our previous system.